Optical fiber having negative dispersion, negative dispersion slope and large effective area

摘要

Embodiments of the invention include an optical communications system with optical fiber cable, coupled between optical transmission and receiving devices, having positive dispersion fiber and corresponding inverse dispersion fiber. The inverse dispersion fiber includes a doped core region with an index of refraction n1, a cladding region with an index of refraction n2, and a trench region, a first barrier region and a second barrier region with indices of refraction n3, n4, and n5, respectively, formed between the doped core region and the cladding region. The various regions of the inverse dispersion fiber are manufactured in such a way that the refractive index value ranges are, e.g., 0.745%<(N1-n2)/n2<0.759%,-0.403%<(N3-n2)/n2<-0.394%, 0.152%<(N4-n2)/n2<0.166%, and -0.083%<(N5-n2)/n2<-0.041%. Inverse dispersion fiber has a chromatic dispersion of approximately -40 picosecond/(nanometer-kilometer) and a relatively large effective core area, Aeff, e.g., greater than approximately 30.0 mum<2, both at a wavelength of 1550 nm.